Executive Summary : | Concrete gravity dams are crucial infrastructure in India for water storage, irrigation, and power generation. However, earthquakes like Bhuj, Koyna, and Uttarkashi have severely damaged these dams, making seismic response and failure a complex subject. The Koyna dam, a benchmark problem, has been the subject of numerous numerical and experimental studies for seismic evaluation. Many concrete gravity dams in India are situated in seismic active zones, and earthquake engineering professionals must manage their seismic risk. Performance-based earthquake engineering (PBEE) design should be adopted to evaluate the seismic risk of dam-reservoir-foundation systems. The next generation PBEE (PBEE-2) has four steps: seismic hazard analysis, structural analysis, damage analysis, and loss analysis. Seismic hazard analysis describes the potential for dangerous earthquake-related natural phenomena such as ground shaking, fault rupture, or soil liquefaction. Structural analysis checks the behavior of the superstructure for different seismic excitations. Damage analysis evaluates the seismic risk of the superstructure, while loss analysis quantifies monetary losses associated with damage and loss of life. The objective of this proposal is to develop guidelines for seismic analysis of concrete gravity dams, which can be incorporated into Part 5 of IS 1893. Important concrete gravity dams in seismic active regions in India will be chosen for seismic risk analysis. Numerical analysis will be carried out considering different load combinations as per IS 6512 (1984), and the PBEE-2 design will be done for existing concrete gravity dams. |